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7. Immunity to RF voltages (in common mode) (S2b) 
 

 
      Operating environment; 
 Temperature 

23  ℃ 

 

Relative Humidity 

40 % 

 
      During the test of immunity to RF voltages (in common mode) the EUT was placed 0.1 M above 
        a metallic ground plane of dimensions 2 x 1 M. 
 
      The criterion concerning acceptable sound interference is a wanted to unwanted audio signal   
        ratio of  ≥40 dB at a wanted signal level of 50 mW. 
 
   The requirements for receivers, multifunction equipment and video tape equipment concerning 
        the immunity to RF voltages in common mode are restricted to the antenna terminals and 
        to the frequency range from 26 MHz to 30 MHz. 
      The cable linking the coupling units to the EUT was short. 
      A band pass filter was connected to the test system and was used for the EUT AF outputs. 

 

      All unused inputs/outputs of the coupling units was terminated with the proper resistance.   
 
      The power cable of the EUT was uniformity bundled together and as short as possible. 
 
   The measurements were performed with test software TS9980 Ver.2.1 
 

 
        Immunity to conducted currents : +/- 2 dB 
 

 
        The equipment does comply with the requirements. 
 
    For the measurement data, see Annex C 
 

 

8. Immunity to ambient electromagnetic fields (S3) 
 

 
      Operating environment; 
 Temperature 

22  ℃ 

 

Relative Humidity 

40 % 

 
      The EUT was placed on a non-metallic support,0.1 m above the lower conductor in the center 
    of the strip line. 
 
      The wanted signal was fed to all input terminals respectively.       
      The unwanted signal is fed to a matching network of the strip line. 
 
      The criterion concerning acceptable sound interference is a wanted to unwanted audio signal   
        ratio of  ≥40 dB at a wanted signal level of 50 mW. 
 
      The audio output power was measured with a 0.5 - 3 kHz band-pass filter. 
      The ground connection of the mains filter (M) was directly connected to the Jacky. 
 
      The audio analyzer was applied without a weighting filter. 
 
   The measurements were performed with test software TS9980 Ver.2.1 
 

 
     Radiated fields  : +/- 2 dB 
 

 
        The equipment does comply with the requirements. 
 
    For the measurement data, see Annex D 
 

 

9. Screening effectiveness (S4) 
 

 
      Operating environment; 
 Temperature 

22  ℃ 

 

Relative Humidity 

40 % 

 
      The equipment under test was placed on a non-metallic table of height 0.8 M. 
      At the side of the antenna input terminal of the equipment under test, a non-metallic table   
        of length 4 M was placed at the same height to provide for movement of the measuring   
    device, an absorbing clamp.  
   An RF signal generator is placed on a third table. 
 
      The equipment under test is connected to the generator, but not connected to the mains supply. 
      The signal from the generator is at the test frequency and un-modulated. 
 

 
     Radiated fields  : +/- 2 dB 
 

 
        The equipment does comply with the requirements. 
 
    For the measurement data, see Annex E 
 

 

10. Electrostatic Discharges (EN 61000-4-2) 
 

 
      Operating environment; 
 Temperature: 

23  ℃ 

 

Relative Humidity: 

40 % 

 

A ground reference plane was located on the floor, and connected to earth via a low impedance connection 
The return cable of the ESD generator was connected to the reference plane. In case of a floor standing 
equipment, EUT was placed on the reference plane on 10cm of insulating support 
In case of table-top equipment, EUT was placed on a wooden table 0.8m above the reference planed On the 
floor. A horizontal coupling plane (HCP) of 1.6*0.8 m was placed on the table, and connected to the reference 
plane via a cable with a 470 ㏀  resistor located in each end (0.5 mm insulating support between EUT and HCP). 
In both cases a vertical coupling plane (VCP) of 0.5*0.5 m was located 10 cm from the EUT’s sides. 
The VCP was connected to the reference plane in the same matter as the HCP. 
The test was done by applying contact and air discharges to the EUT itself, and contact discharges to the 
HCP and VCP. When applying the discharges to the HCP, the tip of the generator was located at each side of the 
EUT, at 10 cm distance. When applying the discharges to the VCP the tip of the generator was located at the 
middle edge of the VCP. The VCP was located 10cm from each side of the EUT. 
Contact discharges of  ±4 kV were applied to various points of the EUT at conductive surfaces, and to the 
HCP/VCP. Air discharges of  ±8 kV were applied to various points of the EUT at non-conductive surfaces. 
Ungrounded equipment, or ungrounded part(s) of equipment, cannot discharge itself similarly to class I 
mains-supplied equipment. If the charge is not removed before the next ESD pulse is applied, it is possible   
that the EUT or part(s) of the EUT be stressed up to twice the intended test voltage.   
Therefore, double-insulated equipment could be charged at an unrealistically high charge, by accumulating   
Several ESD discharges on the capacitance of the class II insulation, and then discharge at the breakdown   
voltage of the insulation with a much higher energy. In the case of class II & III equipment. 
To avoid of unrealistically high charge, it is possible to ionize “using ionizer” before each discharge. 

 

ESD Simulator 

Noiseken 

ESS-2000 

0199C02406 

2008. 12 

Discharge Gun 

Noiseken 

TCP-815P 

1199C02485 

2008. 12 

 

Enclosure 

  J. Y. Yu 

 Basic Standard:  EN 61000-4-2:1998+A2: 2001 

B 

Air Discharge: 

±4, 8 kV 

Contact Discharge: 

±2, 4 kV